Jaw crusher



Sept. 9, 1969 B. VITEZ 3,465,975

JAW CRUSHER Filed Oct. 5, 1967 amp/2W2 @5 72/001 2 A A) @M /w UnitedStates Patent 3,465,975 JAW CRUSHER Bela Vitez, Franklin, Wis., assiguorto Allis-Chalmers Manufacturing Company, Milwaukee, Wis. Filed Oct. 3,1967, Ser. No. 672,605 Int. Cl. B02c 19/00, 13/06 US. Cl. 241-201 8Claims ABSTRACT OF THE DISCLOSURE A toggleless jaw crusher is disclosedhaving a pair of jaws with one jaw fixed to crusher framework and theother jaw movable relative thereto. The movable jaw hangs from aneccentric portion of a rotating drive shaft journaled in a top portionof the movable jaw. A flexible link bar is fixed on'oue end to themovable jaw near the lower end thereof and the other end of the flexiblelink bar is fixed to the framework adjacent the top and fixed jaw sideof the crushing chamber. The crushing motion of the movable jaw isestablished by the rotating eccentric connected to the top of themovable jaw and the swing J of the flexible link bar connected to thebottom of the movable jaw.

BACKGROUND OF THE INVENTION- Field of the invention This inventionrelates to jaw crushers and in particular to a toggleless jaw crusherhaving a movable jaw having one portion connected to an eccentricportion of a drive shaft and another portion flexibly connected to theframework to guide motion of the lower portion of the moving jaw to beas nearly linear as possible, rather than orbital, for etficientcrushing.

Description of the prior art Jaw crushers having a flexible connection,in the form of a coil spring, between the moving jaw and framework areillustrated in United States Patents 2,921,750; 2,984,-

424; 2,996,261; 2,999,651; 3,001,729 and 3,145,938. Two

of the aforementioned patents, namely US. 2,999,651 and US. 3,145,938,additionally disclose crushers in which a movable jaw is without togglesbut is provided'with rigid link bars flexibly connected on one endto amovable jaw and on the other end .to frameworklt isto this latter typeof crusher that the present invention is directed. The flexible endconnections to the rigid l'inkbarsare locations of wear requiringlubrication or wear absorbing replaceable pads. Further, the coilsprings like any spring absorb energy for later return to the mechanism,but they have no definite length and thereforedo not themselves serye toguide the swing of the movable jaw to provide a motion of thelowerportion of the movable jaw in th desired substantially linear path.

SUM MARY OF THE INVENTION It is a primary object of the presentinvention to provide a new and improved jaw crusher having a motion ofthe lower portion of the moving jawras nearly linear and as nearlyperpendicular to the stationary jaw plate asmp "ice Another object ofthe present invention is to provide a new and improved jaw crusherhaving an eccentric drive shaft connected to an upper portion of amovable jaw and a flexible link rigidly fixed on one end to a lowerportion of the movable jaw and rigidly fixed on the other end to anupper portion of framework to guide the motion of the lower portion ofthe movable jaw without relative movement at the link ends, which ifpres-- ent requires lubrication or replaceable wear absorbing pads.

According to a preferred embodiment of the present invention, a crusheris provided with a framework and a pair of jaws within the frameworkdefining a crushing chamber with an inlet opening on top and a dischargeopening at the bottom. One of the jaws is fixed to the framework and theother is hung from a horizontally disposed drive shaft. The drive shafthas end portions journaled in the framework and a midportion, eccentricto the end portions, journaled in an upper portion of the movable jaw. Apair of flexible link bars are provided, with one external to each ofthe framework sides into which the drive shaft is journaled. The barsare each a leaf spring disposed to flex in planes perpendicular to thedrive shaft. A first end of each bar is fixed to a crossbar thatprojects through aligned openings in the framework and is fixed to alower portion of the movable jaw. The other end of each link bar isfixed to the framework at a location spaced away from the drive shaft ina direction toward the fixed jaw. This location for these ends of thelink bar is also at an elevation that is higher than the other ends ofthe link bars which are fixed to the crossbar and lower portion of themovable jaw. As the drive shaft turns the eccentric portion thereofwithin a journal portion of the movable jaw near the top of the jaw, thelink bars flex in planes perpendicular to the drive shaft and swing thelower end of the movable jaw in a path such that the lower portion ofthe movable jaw moves in a substantially linear path which on thecrushing stroke (i.e., movement toward the fixed jaw) has a slightdownward incline that promotes materal flow downwardly through thecrushing chamber.

Other features and objects of the invention that have been attained willappear from the more detailed description of an embodiment of theinvention shown in the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation view of ajaw crusher according to the present invention; and

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2 ofthe drawing, a crusher is shown provided with a framework 3 comprisingat least a pair of spaced apart frame side walls 4, 5 and a trans verseframe member 6. A stationary jaw 10 is attached in fixed position to thetransverse frame member 6. A movable jaw 11 is hung from a horizontallydisposed drive shaft 12. The drive shaft 12 has end portions 13journaled in the frame side walls 4, 5 and a midportion 14 eccentric toend portions 13. The midportion 14 of drive shaft 12 is journaled in anupper portion 15 of the movable jaw 11. The drive shaft 12 is rotatablydriven by means not shown. A flywheel 16 is mounted on shaft 12. Wearplates 17, 18 may be mounted on jaws 10, 11 in a manner according to US.Patent 3,153,512. The jaws 10, 11 and wear plates 17, 18 along with sidewalls 4, 5 define a crushing chamber 20 having an inlet opening 21 ontop and a discharge opening 22 at the bottom.

A pair of flexible link bars 25, 26 are provided, both external to theframework 3. Link bar 25 is externally spaced from side wall 4 and linkbar 26 is externally spaced from side wall 5. Each link bar 25, 26 is aleaf spring comprising a plurality of flat elongated thin strips 27having flat surfaces 28 and edges 29. The link bars 25, 26 are disposedwith their flat surfaces 28 in parallel, i.e., nonintersecting,alignment with respect to the drive shaft 12. This results in theflexing motion of bars 25, 26 being in planes perpendicular to driveshaft 12.

The lower end of each of the flexible link bars 25, 26 is shown as beingfixed to a crossbar 30. The crossbar 30 is made in two parts, an upperand lower part 31, 32 as shown in FIG. 1. The lower ends of the bars 25,26 are sandwiched between the upper and lower parts 31, 32 of crossbar30 and fastened together by a plurality of bolts 33. The crossbar 30projects through aligned openings 34 in side walls 4, 5. Within sidewalls 4, 5 the bar 30 is fixed to a bracket 35 (FIG. 1) by bolts 36. Thebracket 35 may be cast integrally with jaw 11 or fixed thereto, as forexample by welds 37, to the back of the movable jaw 11 adjacent a bottomedge 38.

The upper end of each of the flexible link bars 25, 26 is fixed to thewalls 4, 5 of framework 3 at a location which is shown to be spaced awayfrom drive shaft 12 in a direction toward fixed jaw 10. This locationfor the upper ends of bars 25, 26 is also at an elevation that is higherthan the ends of the bars attached to crossbar a adjacent edge 38 ofmovable jaw 11. The upper ends of the bars 25, 26 are sandwiched betweenmounting blocks 40, 41 and fastened together by bolts 42. The blocks 40,41 are fixed to side wall 4 by welds 43.

In the operation of the described apparatus material such as mineralrock is fed into the inlet opening 21 of crushing chamber 20. Shaft 12is rotated by means, not shown, to turn the eccentric portion 14journaled in the u per portion 15 of movable jaw 11. The action ofeccentric portion 14, combined with the action of the flexible butfinite length bars 25, 26, flexing in planes perpendicular to the driveshaft, results in various portions .of the crushing face of wear plate18 moving toward and away from jaw 10 and wear plate 17, in the orbitalpaths indicated at A, B, C and D. As jaw 11 moves, crossbar 30 moves inopening 34 and the leaf spring strips 27 of bars 25, 26 are flexed toboth guide the swinging motion of jaw 11 in the desired path and toabsorb energy and return it to the machine, all with but relativemovement at the ends of bars 25, 26 such as would, if present, requirelubrication or replaceable wear absorbing pads. All of the paths A, B, Cand D are inclined downwardly in a direction that promotes a steady flowof material through chamber 20 and out discharge opening 22. At theprogressively lower positions indicated at A, B, C and D the orbitalpaths become flatter and near the bottom of chamber 20 become, as at D,substantially linear and nearly perpendicular to wear plate 17 on fixedjaw 10. Thus the desired linear motion is provided at the desiredlocation.

From the foregoing detailed description of the present invention, it hasbeen shown how the objects of the invention have been attained in apreferred manner. However, modifications and equivalents of thedisclosed concepts such as readily occur to those skilled in this artare intended to be included within the scope of this invention.

, ,The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. A crusher comprising a framework, a pair of jaws defining a crushingchamber within said framework, one of said jaws being fixed to saidframework and the other jaw being connected to a rotatable drive shafthaving a first shaft portion journaled in said framework and a secondshaft portion eccentric to the first shaft portion and journaled in afirst portion of the movable jaw, and a flexible link bar fixed on afirst end to a second portion of the movable jaw spaced from the firstportion of the movable jaw, and a second end of the flexible link barfixed to a portion of the framework spaced from the first shaft portionjournaled in the framework.

2. In a Crusher according to claim 1, said flexible link bar being aleaf spring disposed to flex in a plane perpendicular to a central axisthrough the drive shaft.

3. In a crusher according to claim 1, a pair of said flexible link barseach external to the framework and on opposite sides thereof with acrossbar projecting through aligned openings in said frameworkconnecting said pair of link bars together and to said second portion ofthe movable jaw.

4. In a crusher according to claim 3, said link bars each being a leafspring disposed to flex in a plane perpendicular to said crossbar.

5. A crusher comprising a framework, a pair of jaws defining a crushingchamber within said framework, one of said jaws being fixed to theframework and the other jaw being hung from a horizontally disposedrotatable drive shaft having a first portion journaled in said frameworkand a second portion eccentric to said first portion and journaled in anupper portion of said movable jaw, and a flexible link bar fixed on afirst end to a lower portion of said movable jaw, and a second end ofsaid flexible link bar fixed to a portion of said framework in avertical plane horizontally spaced from the eccentric portion of saiddrive shaft and spaced above a horizontal plane through the first fixedend of said link bar.

6. In a crusher according to claim 5, said flexible link bar being aleaf spring disposed to flex in a plane perpendicular to a central axisthrough the drive shaft.

7. In a crusher according to claim 5, a pair of said flexible link barseach external to the framework and on opposite sides thereof with acrossbar projecting through aligned openings in said frameworkconnecting said pair of link bars together and to said lower portion ofthe movable jaw.

8. In a crusher according to claim 7, said link bars each being a leafspring disposed to flex in a plane perpendicular to said crossbar.

References Cited UNITED STATES PATENTS 645,586 3/1900 Bunnell 241-219853,656 5/1907 Sturtevant et al. 241219 2,183,698 12/ 1939 Schieferstein241219 X 3,145,938 8/1964 Pollitz 241-219 X FRANK T. YOST, PrimaryExaminer US. Cl. X.R. 241,2l9

